3 papers
hep-th2024
Gravitational lensing in a plasma from worldlines
Francesco Comberiati, Leonardo de la Cruz
We study the deflection of light rays in a cold, non-magnetized plasma using the worldline framework. Starting from Synge's Hamiltonian formalism, we construct a position-space act…
hep-th2023
Six-dimensional one-loop divergences in quantum gravity from the spinning particle
Fiorenzo Bastianelli, Francesco Comberiati, Filippo Fecit +1
In this work, we investigate the computation of the counterterms necessary for the renormalization of the one-loop effective action of quantum gravity using both the worldline form…
hep-th2020
Path integral calculation of heat kernel traces with first order operator insertions
Fiorenzo Bastianelli, Francesco Comberiati
We study generalized heat kernel coefficients, which appear in the trace of the heat kernel with an insertion of a first-order differential operator, by using a path integral repre…